<template>
    <div>
        <el-switch v-model="draggable" active-text="开启拖拽" inactive-text="关闭拖拽"></el-switch>
        <el-button v-if="draggable" @click="batchSave">批量保存</el-button>
        <el-button type="danger" @click="batchDelete">批量删除</el-button>
        <el-tree :data="menus" :props="defaultProps" :expand-on-click-node="false" show-checkbox node-key="catId"
            :default-expanded-keys="expandedKey" :draggable="draggable" :allow-drop="allowDrop" @node-drop="handleDrop"
            ref="menuTree">
            <span class="custom-tree-node" slot-scope="{ node, data }">
                <span>{{ node.label }}</span>
                <span>
                    <el-button v-if="node.level <= 2" type="text" size="mini"
                        @click="() => append(data)">Append</el-button>
                    <el-button type="text" size="mini" @click="edit(data)">edit</el-button>
                    <el-button v-if="node.childNodes.length == 0" type="text" size="mini"
                        @click="() => remove(node, data)">Delete</el-button>
                </span>
            </span>
        </el-tree>

        <el-dialog :title="title" :visible.sync="dialogVisible" width="30%" :close-on-click-modal="false">
            <el-form :model="category">
                <el-form-item label="分类名称">
                    <el-input v-model="category.name" autocomplete="off"></el-input>
                </el-form-item>
                <el-form-item label="图标">
                    <el-input v-model="category.icon" autocomplete="off"></el-input>
                </el-form-item>
                <el-form-item label="计量单位">
                    <el-input v-model="category.productUnit" autocomplete="off"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="dialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="submitData">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
//这里可以导入其他文件（比如：组件，工具js，第三方插件js，json文件，图片文件等等）
//例如：import 《组件名称》 from '《组件路径》';

export default {
    //import引入的组件需要注入到对象中才能使用
    components: {},
    props: {},
    data() {
        return {
            pCid: [],
            draggable: false,
            updateNodes: [],
            maxLevel: 0,
            title: "",
            dialogType: "", //edit,add
            category: {
                name: "",
                parentCid: 0,
                catLevel: 0,
                showStatus: 1,
                sort: 0,
                productUnit: "",
                icon: "",
                catId: null
            },
            dialogVisible: false,
            menus: [],
            expandedKey: [],
            defaultProps: {
                children: "children",
                label: "name"
            }
        };
    },

    //计算属性 类似于data概念
    computed: {},
    //监控data中的数据变化
    watch: {},
    //方法集合
    methods: {
        getMenus() {
            this.$http({
                url: this.$http.adornUrl("/product/category/list/tree"),
                method: "get"
            }).then(({ data }) => {
                console.log("成功获取到菜单数据...", data.data);
                this.menus = data.data;
            });
        },
        batchDelete() {
            let catIds = [];
            let checkedNodes = this.$refs.menuTree.getCheckedNodes();
            console.log("被选中的元素", checkedNodes);
            for (let i = 0; i < checkedNodes.length; i++) {
                catIds.push(checkedNodes[i].catId);
            }
            this.$confirm(`是否批量删除【${catIds}】菜单?`, "提示", {
                confirmButtonText: "确定",
                cancelButtonText: "取消",
                type: "warning"
            })
                .then(() => {
                    this.$http({
                        url: this.$http.adornUrl("/product/category/delete"),
                        method: "post",
                        data: this.$http.adornData(catIds, false)
                    }).then(({ data }) => {
                        this.$message({
                            message: "菜单批量删除成功",
                            type: "success"
                        });
                        this.getMenus();
                    });
                })
                .catch(() => { });
        },
        batchSave() {
            this.$http({
                url: this.$http.adornUrl("/product/category/update/sort"),
                method: "post",
                data: this.$http.adornData(this.updateNodes, false)
            }).then(({ data }) => {
                this.$message({
                    message: "菜单顺序等修改成功",
                    type: "success"
                });
                //刷新出新的菜单
                this.getMenus();
                //设置需要默认展开的菜单
                this.expandedKey = this.pCid;
                this.updateNodes = [];
                this.maxLevel = 0;
                // this.pCid = 0;
            });
        },
        handleDrop(draggingNode, dropNode, dropType, ev) {
            console.log("handleDrop: ", draggingNode, dropNode, dropType);
            //1、当前节点最新的父节点id
            let pCid = 0;
            let siblings = null;
            if (dropType == "before" || dropType == "after") {
                pCid =
                    dropNode.parent.data.catId == undefined
                        ? 0
                        : dropNode.parent.data.catId;
                siblings = dropNode.parent.childNodes;
            } else {
                pCid = dropNode.data.catId;
                siblings = dropNode.childNodes;
            }
            this.pCid.push(pCid);

            //2、当前拖拽节点的最新顺序，
            for (let i = 0; i < siblings.length; i++) {
                if (siblings[i].data.catId == draggingNode.data.catId) {
                    //如果遍历的是当前正在拖拽的节点
                    let catLevel = draggingNode.level;
                    if (siblings[i].level != draggingNode.level) {
                        //当前节点的层级发生变化
                        catLevel = siblings[i].level;
                        //修改他子节点的层级
                        this.updateChildNodeLevel(siblings[i]);
                    }
                    this.updateNodes.push({
                        catId: siblings[i].data.catId,
                        sort: i,
                        parentCid: pCid,
                        catLevel: catLevel
                    });
                } else {
                    this.updateNodes.push({ catId: siblings[i].data.catId, sort: i });
                }
            }

            //3、当前拖拽节点的最新层级
            console.log("updateNodes", this.updateNodes);
        },
        updateChildNodeLevel(node) {
            if (node.childNodes.length > 0) {
                for (let i = 0; i < node.childNodes.length; i++) {
                    var cNode = node.childNodes[i].data;
                    this.updateNodes.push({
                        catId: cNode.catId,
                        catLevel: node.childNodes[i].level
                    });
                    this.updateChildNodeLevel(node.childNodes[i]);
                }
            }
        },
        allowDrop(draggingNode, dropNode, type) {
            //1、被拖动的当前节点以及所在的父节点总层数不能大于3

            //1）、被拖动的当前节点总层数
            console.log("allowDrop:", draggingNode, dropNode, type);
            //
            this.countNodeLevel(draggingNode);
            //当前正在拖动的节点+父节点所在的深度不大于3即可
            let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;
            console.log("深度：", deep);

            //   this.maxLevel
            if (type == "inner") {
                // console.log(
                //   `this.maxLevel：${this.maxLevel}；draggingNode.data.catLevel：${draggingNode.data.catLevel}；dropNode.level：${dropNode.level}`
                // );
                return deep + dropNode.level <= 3;
            } else {
                return deep + dropNode.parent.level <= 3;
            }
        },
        countNodeLevel(node) {
            //找到所有子节点，求出最大深度
            if (node.childNodes != null && node.childNodes.length > 0) {
                for (let i = 0; i < node.childNodes.length; i++) {
                    if (node.childNodes[i].level > this.maxLevel) {
                        this.maxLevel = node.childNodes[i].level;
                    }
                    this.countNodeLevel(node.childNodes[i]);
                }
            }
        },
        edit(data) {
            console.log("要修改的数据", data);
            this.dialogType = "edit";
            this.title = "修改分类";
            this.dialogVisible = true;

            //发送请求获取当前节点最新的数据
            this.$http({
                url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
                method: "get"
            }).then(({ data }) => {
                //请求成功
                console.log("要回显的数据", data);
                this.category.name = data.data.name;
                this.category.catId = data.data.catId;
                this.category.icon = data.data.icon;
                this.category.productUnit = data.data.productUnit;
                this.category.parentCid = data.data.parentCid;
                this.category.catLevel = data.data.catLevel;
                this.category.sort = data.data.sort;
                this.category.showStatus = data.data.showStatus;
                /**
                 *         parentCid: 0,
                catLevel: 0,
                showStatus: 1,
                sort: 0,
                 */
            });
        },
        append(data) {
            console.log("append", data);
            this.dialogType = "add";
            this.title = "添加分类";
            this.dialogVisible = true;
            this.category.parentCid = data.catId;
            this.category.catLevel = data.catLevel * 1 + 1;
            this.category.catId = null;
            this.category.name = "";
            this.category.icon = "";
            this.category.productUnit = "";
            this.category.sort = 0;
            this.category.showStatus = 1;
        },

        submitData() {
            if (this.dialogType == "add") {
                this.addCategory();
            }
            if (this.dialogType == "edit") {
                this.editCategory();
            }
        },
        //修改三级分类数据
        editCategory() {
            var { catId, name, icon, productUnit } = this.category;
            this.$http({
                url: this.$http.adornUrl("/product/category/update"),
                method: "post",
                data: this.$http.adornData({ catId, name, icon, productUnit }, false)
            }).then(({ data }) => {
                this.$message({
                    message: "菜单修改成功",
                    type: "success"
                });
                //关闭对话框
                this.dialogVisible = false;
                //刷新出新的菜单
                this.getMenus();
                //设置需要默认展开的菜单
                this.expandedKey = [this.category.parentCid];
            });
        },
        //添加三级分类
        addCategory() {
            console.log("提交的三级分类数据", this.category);
            this.$http({
                url: this.$http.adornUrl("/product/category/save"),
                method: "post",
                data: this.$http.adornData(this.category, false)
            }).then(({ data }) => {
                this.$message({
                    message: "菜单保存成功",
                    type: "success"
                });
                //关闭对话框
                this.dialogVisible = false;
                //刷新出新的菜单
                this.getMenus();
                //设置需要默认展开的菜单
                this.expandedKey = [this.category.parentCid];
            });
        },

        remove(node, data) {
            var ids = [data.catId];
            console.log(data)
            this.$confirm(`是否删除【${data.name}】菜单?`, "提示", {
                confirmButtonText: "确定",
                cancelButtonText: "取消",
                type: "warning"
            })
                .then(() => {
                    this.$http({
                        url: this.$http.adornUrl("/product/category/delete"),
                        method: "post",
                        data: this.$http.adornData(ids, false)
                    }).then(({ data }) => {
                        this.$message({
                            message: "菜单删除成功",
                            type: "success"
                        });
                        //刷新出新的菜单
                        this.getMenus();
                        //设置需要默认展开的菜单
                        this.expandedKey = [node.parent.data.catId];
                    });
                })
                .catch(() => { });

            console.log("remove", node, data);
        }
    },
    //生命周期 - 创建完成（可以访问当前this实例）
    created() {
        this.getMenus();
    },
    //生命周期 - 挂载完成（可以访问DOM元素）
    mounted() { },
    beforeCreate() { }, //生命周期 - 创建之前
    beforeMount() { }, //生命周期 - 挂载之前
    beforeUpdate() { }, //生命周期 - 更新之前
    updated() { }, //生命周期 - 更新之后
    beforeDestroy() { }, //生命周期 - 销毁之前
    destroyed() { }, //生命周期 - 销毁完成
    activated() { } //如果页面有keep-alive缓存功能，这个函数会触发
};
</script>

<style lang='scss' scoped>
//@import url();引入公共css类</style>